The average of a collection of 18 measurements is calculated to be 46 cm. But later it is found that a mistake has occurred in one of the measurements which is recorded as 56 cm in place of 52 cm, then the correct average is....
The average temperature of first three days in a week is 24ºC and that of the next three days is 27ºC. If the average temperature of the whole week is 26.5ºC, what is the temperature of the last day of the week?
Correct Answer is: 32.50ºC
Sum of temperature of first 3 days = 3 × 24 = 72°C
Sum of temperature of next 3 days = 3 × 27 = 81°C
Sum of temperature of whole week = 7 × 26.5 = 185.5°C
The temperature of the last day = (185.5 – 72 – 81) = 32.50°C
The sum of ages of Amar, Akbar and Anthony is 80 years. What was the total of their ages three years ago?
Correct Answer is: 71 years
The average of X1, X2 and X3 is 14. Twice the sum of X2 and X3 is 30. What is the value of X1?
Correct Answer is: 27
Out of three annual examinations, each with a total of 500 marks, a student secured average marks of 45% and 55% in the first and second annual examinations. To have an overall average of 60%, how many marks does the student need to secure in the third annual examination?
Correct Answer is: 400
The average salary of 100 employees in an office is 16,000 per month. The management decided to raise salary of every employee by 5% but stopped a transport allowance of Rs 800 per month which was paid earlier to every employee. What will be the new average monthly salary?
Cannot be known since data are insufficient
Correct Answer is: Rs 16,000
5% increase in salary (16000 X 5%) i.e. 800 = Rs 800 stoppage of transport allowance in salary; so no resultant change in salary.
In a one-day series against Pakistan, Sachin's average was 54 runs per match, Dravid's average was 57 runs per match and Ganguly's average was 37 runs per match in 5 matches. What was the average of the three players considered together per match?
Correct Answer is: 148
Total runs scored by all three players = (54+57+37)X5 = 740
Avg score of 3 players per match collectively = 740/5 = 148
The mean of 19 observations is 24. If the mean of the first 10 observations is 17 and that of the last 10 observations is 24, find the 10th observation.
Correct Answer is: 46
19 X 24 – 10 X 17 – 10 X 24 = 46
The average temperature of Monday, Tuesday and Wednesday was 30 degree C and that of Tuesday, Wednesday and Thursday was 33 degree C. If the temperature on Monday was 32 degree C, then the temperature on Thursday was…..
Correct Answer is: 41
Mon + Tue + Wed = 30 X 3 = 90........equn A
Tue + Wed + Thu = 33 X 3 = 99.........equn B
Mon = 32.............................................equn C
Equn A - Equn B=> Mon-Thu = -9......equn D
Equn C - Equn D=> Thu = 41
The average of 50 numbers is 38. If two numbers namely 45 and 55 are discarded, the average of the remaining numbers is……….